8
NXR3i
28/08/2012 - 300029292-001-01
PROVISOIRE
NXR3i
28/08/2012 - 300029292-001-02
3 Technical description
3.1 General description
The boilers of the NXR3i range are pressurised hot water boilers
designed for connecting to a flue pipe which require a separate
automatic fuel-oil or gas burner. NXR3i boilers have the following
characteristics:
- Heating body in cast iron.
- KSF ISR or KSF CE control panel.
- Production of domestic hot water can be ensured by a separate hot
water calorifier.
3.2 Technical specifications
In order for the boiler to operate correctly, it is imperative
to respect the draught at the nozzle: 0 at the nozzle.
Conditions of use:
Test conditions:
Maximum operating temperature: 100 °C
CO
²
Fuel oil = 13%
Maximum operating pressure: 6 bar
CO
²
Natural gas = 9.5%
Thermostat adjustable from 30 to 90°C
Ambient temperature: 20 °C
Safety thermostat: 110 °C
Boiler
NXR3i-4
NXR3i-5
NXR3i-6
NXR3i-7
NXR3i-8
NXR3i-9
Useful output
kW
70-105
105-140
140-180
180-230
230-280
280-330
Power input
kW
76-117
115-156
153-199
197-253
252-309
305-361
Water content
l
96
116
136
156
176
196
Number of sections
4
5
6
7
8
9
Stand-by losses - 50 °C (A)
%
0.17
0.14
0.13
0.11
0.10
0.09
Number of baffle plates
6
10
10
6
6
6
Water resistance
∆
T = 15K
mbar
(B)
6.2
10.9
20.4
30
44.5
63.8
Flue gas temperature (C)
°C
210
210
210
210
210
210
Pressure in the furnace for nozzle pressure = 0 (C)
(D)
mbar
(B)
0.3
0.6
1.1
1.6
2.2
2.5
Mass flue gas flow rate (C)
Fuel oil
Kg/h
178
238
306
391
475
560
Natural gas
Kg/h
187
250
321
410
499
588
Flue gas circuit volume (Flue ways + Combustion
chamber)
m
3
0.163
0.206
0.249
0.292
0.335
0.378
Combustion chamber
Inscribed
diameter
mm
377
377
377
377
377
377
Length
mm
571
731
891
1051
1211
1371
Volume
m
3
0.096
0.122
0.148
0.174
0.200
0.226
Weight (empty)
kg
612
736
846
981
1103
1230
(A)
Stand-by losses in accordance with prevailing standard
(B)
1 mbar = 10 mmWG = 10 daPa
(C) Nominal operation (top boiler power)
